DDDDD.jpg may have the lowest contrast, (as in the other patterns may hide a carry a little better) but alot of this is going to be a function of the background, where you're carrying, how you wear the shirt and any bulges.
Interesting question.

Hahahaha. Thats funny I know exactly what you mean. To the OP all those shirts look sufficient to cover most firearms. That is the type of shirt I'm usually wearing when carrying. I like the short sleeves in summer but it still conceals and is comfortable. I agree you might need a little heaver material like Dwight said. An occasional snag with my S&W1911 occurs as well. Still, lighter material conceals well for me also. Im 5' 8" 170lbs but can conceal a full size 1911 well, go figure. I guess you just cant beat single stacks.

But, my belief is the clothes used for CC should help you blend in to the crowd.

For example:

In Sc where I live beach and golf wear are very common. So, polos & beach shirts are fine in most places.
But,
some places that you may go, people will be wearing more "casual" wear in "muted" tones. In a case like that, you go with clothes that will help you blend in.

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